Radio central station alarm system

摘要: A radio central station alarm system including a and plurality of remote stations for transmitting signals to the by means signals. Alarm are transmitted repeatedly in sequence which reduces probability that one will be completely obscured other stations. pulse position modulation binary data format is used simplifies both apparatus facilitates error-free transmission. The highly immune noise performs number tests on received reduce or eliminate false erroneous indications. Latching sensor circuits provided use at insure all transmission sequences completed. Protective disabling any transmits longer than maximum allowable interval.